What is the role of oral glucose tolerance testing in the diagnosis of hypoglycemia (low blood sugar)?

Updated: Jul 23, 2020
  • Author: Osama Hamdy, MD, PhD; Chief Editor: Romesh Khardori, MD, PhD, FACP  more...
  • Print

Administer an oral glucose tolerance test if reactive hypoglycemia is suspected. An oral glucose tolerance test provides little benefit for the evaluation of fasting hypoglycemia. Perform the test for 5 hours while simultaneously testing glucose and insulin levels. To be meaningful, low blood sugar (< 50 mg/dL [< 2.78 mmol/L]) during the test should be accompanied by typical symptoms. Response to a mixed meal may be more representative.

Did this answer your question?
Additional feedback? (Optional)
Thank you for your feedback!